softbricked htc 626

Posting on behalf of one of my mates. He tried rooting his htc desire 626s Tmobile us. Unfortunately he messed up and it ran into a bootloop along with a coldboot message. He tried flashing ruu files. But does not work. Was wondering if anyone has a stock flashable rom or a backup of their system. So he could restore via twrp? Any other possible solutions as many others are running into the same ditch. Please help.
Thanks in advance.

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